KR101129838B1 - Apparatus and method for performing video communication - Google Patents

Abstract

Disclosed herein are embodiments of a video calling device and method. According to embodiments of the present invention, voice data may be transmitted and received via a public switched telephone network (PSTN). The video call request message may be generated and transmitted according to H.323 or Session Initiation Protocol (SIP) based on the information related to the PSTN telephone number of the counterpart device that transmits and receives the voice data. An approval message for the video call request message is received, and video data can be transmitted and received. According to an embodiment of the present invention, through a message exchange according to a standard communication standard, a video call may be performed to transmit and receive voice data through a PSTN and to transmit and receive video data through an IPN.

Video call, video call, PSTN

Description

Video call device and method {APPARATUS AND METHOD FOR PERFORMING VIDEO COMMUNICATION}

Embodiments of the present invention relate to voice and video communications, and more particularly to an apparatus and method for video telephony.

With the development of network and communication technologies, the face of so-called video calls or video calls with face-to-face calls has been reached. Video telephony transmits video and audio data over long distances using Internet Protocol (IP) or wired modems in accordance with the techniques set out in the H.323 and H.324 standards. Since it requires a completely different network and terminal than a public switched telephone network (PSTN), there is a problem that a considerable cost is required for the construction and dissemination of a communication network. Therefore, it is difficult to secure a good and stable service quality not only a relatively large amount of video data but also a small amount of audio data.

Therefore, a method of transmitting voice data to the PSTN and image data to the IPN may be considered. In the prior art, a separate server has been provided for processing such a video call. That is, a device requesting a video call during a voice call registers its own IP address and port with the server, and the server transmits these values to the counterpart device to enable the transmission and reception of video data through a 1: 1 connection. .

Therefore, in the conventional method, the video call terminal has a specific interface for accessing a server managing an IP address and a port, or uses a frequency band not used for a voice call in the PSTN (CID: Calling Identity). It was necessary to send the IP address and port to the counterpart device in the form of 'Delivery'. As such, after exchanging mutual IP addresses and ports, one-to-one connection is established by calling the other party's IP address and port and video can be transmitted.

However, such a conventional technology does not conform to the standard standard used in the communication network, and there is a problem in that it does not consider a communication environment that is already configured. Specifically, the following problems may be mentioned.

First, in order to know the other party's IP address and port, a special server that registers, forwards, and manages the IP address and port must be installed separately. Second, access to these special servers requires protocols that are defined separately, not standard. Third, since the protocol connecting to the server does not follow the standard communication standard, it is difficult to interwork with other communication devices operating according to the standard communication standard on the network. In particular, it is not compatible with other standard video telephony devices that use only IP. Fourth, since the connection method made after IP address and port exchange is 1: 1 communication, it is a basic voice call and cannot support additional services such as a conference call or a call transfer supported by the network. Fifth, a separate environment must be created for this service, and additional costs and time are required to interwork with the existing environment. Sixth, since the other party calls only the IP address and port, video calls are difficult to make in a secure environment such as NAT or firewall. ^{Seventh, 3GPP (3 rd Generation Partnership Project} ) , without or using standard communication protocols proposed in standardization bodies such as the IETF (Internet Engineering Task Force) uses a separate interface, does not meet the standards trends between countries or another within the same country Interoperability between carriers is difficult

An object of the present invention is to solve the above-mentioned problems of the prior art, and through the message exchange according to the standard communication standard, transmitting and receiving voice data through the Public Switched Telephone Network (PSTN) and video over the Internet Protocol Network (IPN) The present invention provides a video call apparatus and method for transmitting and receiving data.

According to an embodiment of the present invention, a video call apparatus is provided. The video call device according to H.323 or Session Initiation Protocol (SIP) based on a public switched telephone network (PSTN) interface for transmitting and receiving voice data and information related to the PSTN telephone number of the counterpart device for transmitting and receiving voice data. A video call request / approval message generator for generating a video call request message, and an IPN (Internet Protocol Network) for transmitting the video call request message, receiving an approval message for the video call request message, and transmitting and receiving video data. ) May include an interface.

In one embodiment, the video call request / approval message generator of the video call device generates a message for requesting the Internet phone number of the counterpart device to the telephone numbering mapping (ENUM) server based on the PSTN phone number of the counterpart device; And a phone number obtaining unit obtaining an internet phone number of the counterpart device from the response of the ENUM server.

In an embodiment, the video call request / authorization message generator of the video call device may generate a video call request message including its own PSTN phone number.

In one embodiment, the PSTN interface of the video call device may transmit a Dual Tone Multi-Frequency (DTMF) tone for the video call to the counterpart device. The video call request / approval message generator of the video call device may generate a video call request message including DTMF tone information for the video call.

According to an embodiment of the present invention, a video call apparatus is provided. The video call device includes a public switched telephone network (PSTN) interface for transmitting and receiving voice data, an Internet Protocol Network (IPN) interface for receiving a video call request message according to H.323 or a Session Initiation Protocol (SIP), and the voice data. The apparatus may include a video call request / approval message generating unit configured to check whether the counterpart device transmitting and receiving the device and the device transmitting the video call request message are the same and generating a video call approval message. The IPN interface may transmit the video call approval message and transmit and receive video data.

According to an embodiment of the present invention, a video call method is provided. The video call method may include transmitting and receiving voice data through a public switched telephone network (PSTN) and based on information related to a PSTN telephone number of a counterpart device transmitting and receiving the voice data, H.323 or Session Initiation Protocol (SIP). Generating a video call request message, transmitting the video call request message through an Internet Protocol Network (IPN), receiving an approval message for the video call request message, and video data through the IPN. It may include transmitting and receiving.

According to an embodiment of the present invention, a video call method is provided. The video call method includes transmitting and receiving voice data through a Public Switched Telephone Network (PPSTN), receiving a video call request message through an Internet Protocol Network (IPN) according to H.323 or Session Initiation Protocol (SIP), And checking whether the counterpart device that transmits / receives the voice data and the device that transmitted the video call request message are the same, and transmitting a video call approval message through the IPN, and transmitting and receiving video data.

According to embodiments of the present invention, the following effects can be obtained.

First, through a message exchange according to a standard communication standard, it is possible to perform a video call for transmitting and receiving voice data through the PSTN and video data through the IPN. Therefore, it does not require a separate server or a separate protocol for performing a video call, and can perform a video call for transmitting and receiving voice data with high quality according to a standard communication standard.

Second, since the call is performed in accordance with the standard communication standard, it is not limited to the 1: 1 connection type and can provide an additional service provided by the network.

Third, even in environments with security firewalls such as NAT and Firewall, calls can be made according to standard communication standards.

Fourth, by connecting to the ENUM server to confirm the Internet telephone number of the counterpart device, it is possible to perform a video call according to the standard.

Fifth, the PSTN telephone number of the device that transmits the video call request message can be checked by accessing the ENUM server. Therefore, since the device that sent the video call request message is the same as the device currently in the voice call, the video call request can be approved, thereby preventing the collision of the call.

Sixth, from the information included in the video call request message, it may be checked whether the device that has transmitted the video call request message and the device currently in the voice call are the same. Therefore, even when the ENUM server cannot be accessed, the collision of the call can be prevented by checking whether the device that has transmitted the video call request message and the device currently in the voice call are the same.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a block diagram of an exemplary network environment in which the present invention may be practiced. As shown in FIG. 1, the network environment 100 includes a public switched telephone network (PSTN) 140, an Internet Protocol network (IPN) 160, and a public telephone network 140 and an Internet protocol network ( And a video call device 120a or 120b that performs video (and voice) call in association with 160. According to an embodiment of the present invention, the video call apparatuses 120a and 120b may transmit and receive analog audio data through the PSTN 140 and digital video data through the IPN 160. In FIG. 1, two video calling apparatuses 120a and 120b are illustrated for explanation, but this is only an example and the present invention is not limited thereto.

In one embodiment of the invention, IPN 160 is any network capable of transmitting data in the form of packets, such as a wired network such as Ethernet, wireless Internet such as Wi-Fi, Wireless Broadband Internet (Wibro) and WiMAX (World). Mobile networks such as Interoperability for Microwave Access) or mobile networks that support packet transmission (e.g., 3G mobile networks such as WCDMA or CDMA2000, 3.5G mobile networks such as HSDPA or HSUPA, or 4G to be developed in the future). have.

As shown in FIG. 1, the IPN 160 may include an ENUM server 162 that operates a telephone numbering mapping (ENUM) service. In one embodiment, the PSTN telephone number and the Internet telephone number of the video calling apparatuses 120a and 120b are connected to the PSTN 140 and the IPN 160, or at the time of installation (in advance) by the ENUM server ( 162).

ENUM is a next-generation Internet integrated number identification system that combines IP addresses and PSTN's telephone numbers into one. In order to guarantee the commonality and uniqueness of Internet application services, E.164, which is a general public network international telephone number system, is linked with various address systems such as telephone, email, facsimile, and internet phone. It defines the number system as a technology that converts a string such as document, image, fax, and email. ENUM uses the telephone number as it is as an Internet address. For example, if the telephone number is 02-3398-0114, 41108933 (telephone number) + 2 (area code) + 28 (country code) .e164 (international public telephone numbering system) .a (arpa: server) is the Internet address. The phone numbers are arranged in reverse order, as the Internet address is recognized from the backseat to the country, institution name and address.

In one embodiment, the ENUM server 162 may receive a message requesting the Internet phone number of the video call device (120b, 120a) in the voice call from the video call device (120a, 120b). The message for requesting the Internet phone number may include PSTN phone numbers of the counterpart video call devices 120b and 120a. The ENUM server 162 searches the internal database (not shown) to retrieve the Internet phone number corresponding to the PSTN phone number, and then sends the message to the other video call device 120a or 120b. Send a message containing an Internet phone number of

Similarly, the ENUM server 162 receives a message requesting the PSTN telephone numbers of the other video telephone apparatuses 120a and 120b from the video telephone apparatuses 120b and 120a, and in response, includes the corresponding PSTN telephone numbers. You can send a message. The message requesting the PSTN telephone number includes the Internet telephone numbers of the requested video calling apparatuses 120a and 120b, and the ENUM server 162 queries the internal database (not shown) for the PSTN telephone corresponding to the Internet telephone number. You can search for a number.

As shown in FIG. 1, the IPN 160 may further include a Session Initiation Protocol (SIP) server 164. In one embodiment, the SIP server 164 receives from the video call device (120a, 120b) a video call request message including the Internet phone number of the person and the other device (120b, 120a), and the other device (120b, 120a). In one embodiment, the video call request message may include a PSTN number of the devices 120a and 120b requesting the video call or a specific tone of dual tone multi-frequency (DTMF). In an embodiment, the SIP server 164 may receive a video call request approval message from the counterpart device 120b or 120a and transmit the video call request approval message to the device 120a or 120b that has requested the video call. In one embodiment, SIP server 164 may be replaced with any server operating a video telephony service according to the H.323 standard.

In one embodiment, the video call device 120b, 120a, in response to receiving the video call request message from the SIP server 164, the PSTN of the device 120a, 120b that requested the video call to the ENUM server 162. You can request a phone number. If the confirmed PSTN phone number is the same as the PSTN phone numbers of the devices 120a and 120b currently in the voice call, the video call devices 120b and 120a may transmit a video call request approval message to the SIP server 164. . In contrast, the video call device 120b or 120a is a device 120a in which the video call request message 120a or 120b currently transmits the video call request message based on the PSTN information included in the video call request message or a specific DTMF tone. , 120b).

In one embodiment, the reason for transmitting DTMF tones to confirm whether the devices 120a and 120b that have transmitted the video call request message and the devices 120a and 120b that are currently in the voice call are the same. For example, when the device 120a that has sent the voice call is using a "prohibit caller indication" service or the like, the called device 120b cannot recognize the PSTN telephone number of the counterpart device 120a in the voice call. Thereafter, even if the calling device 120a transmits the video call request message, and the called device 120b obtains the PSTN phone number of the device sending the video call request message (for example, the PSTN information included in the video call request message) is received. Or by requesting the ENUM server 162), the destination device 120b does not recognize the PSTN telephone number of the device 120a currently in the voice call, and thus the device that has transmitted the video call request message with the device in the voice call. Can not be determined whether the same.

In such a case, before the video call request message is transmitted, the video call device 120a transmits an arbitrary DTMF tone to the counterpart video call device 120b in the voice call in advance, and transmits the value of the transmitted DTMF tone. The video call request message may be transmitted to the video call device 120b. In response to receiving the video call request message, the video call device 120b receives the DTMF tone value previously received from the other party in the voice call and the DTMF tone included in the video call request message received from the video call request device. By comparing the values of two devices, you can determine whether they are the same.

According to an embodiment of the present invention, a video call may be performed through an ENUM server or a message according to a standard communication standard such as a SIP message to transmit and receive voice data through a PSTN and to transmit and receive video data through an IPN. Therefore, it does not require a separate server or a separate protocol for performing a video call, and can perform a video call for transmitting and receiving voice data with high quality according to a standard communication standard.

2 is a block diagram of a video call device according to an embodiment of the present invention. It is noted that the components shown in FIG. 2 are exemplary, and each component may be integrated, separated, or omitted according to a design specification, and the connection relationship of each component may also be changed.

As illustrated in FIG. 2, the video call apparatus 200 may include a video call request / approval input unit 210 that receives a video call request from a user. When the video call apparatus 200 receives the video call request message from another video call apparatus, the video call request / approval input unit 210 may be operated to receive approval from the user. In one embodiment, the video call request / approval input unit 210 may be designed to be implemented through a key button.

In one embodiment, the video call device 200 may further include a PSTN interface 220 connected to the PSTN to transmit and receive analog voice data. In one embodiment, the PSTN interface 220 may receive information on the PSTN telephone number of the voice call originating device according to caller identity delivery (CID). In one embodiment, the PSTN interface 220 may be designed to include a telephone line connector, such as an RJ11 terminal.

The PSTN interface 220 reproduces the received analog voice data through a speaker (not shown), and converts the voice data input from the microphone (not shown) to be transmitted through the PSTN interface 220. Can be connected. The speech processor 230 may be implemented by a technique known in the art or a technology to be developed in the future, and details thereof are omitted herein.

As shown in FIG. 2, the PSTN interface 220 may be connected to the video call request / approval input unit 210. According to an embodiment, when the video call request / approval input unit 210 receives a video call request from the user, the PSTN interface 220 may transmit a specific DTMF tone for the video call to the counterpart video call device in the voice call. have. Similarly, PSTN interface 220 may receive a specific DTMF tone for a video call from another video call device.

According to an embodiment of the present disclosure, when the PSTN interface 220 receives a specific DTMF tone for a video call from the counterpart video call device in a voice call, the video call request / approval input unit 210 receives an approval from the user. It can work. When the video call request / approval input unit 210 receives an approval from the user, the video call request / approval input unit 210 transmits the approval to the counterpart video call device through the PSTN interface 220, and then a message exchange for the video call may be performed. In this embodiment, if the device that has sent the video call request message and the voice call counterpart device are identified to be the same in the above-described device checking process, the video call request message is automatically sent without the user's approval again. You can send it to the sending device.

According to another exemplary embodiment, when the PSTN interface 220 receives a specific DTMF tone for a video call from a counterpart video call device in a voice call, the PSTN interface 220 may transmit information on the received DTMF tones to a device that later transmits a video call request message. It can be used to check whether the voice call counterpart devices are the same. In this embodiment, if it is confirmed that the device that sent the video call request message and the voice call counterpart device are the same, the video call request message is received after the video call request / approval input unit 210 receives the user's approval. Can be transmitted to the transmitting device. The video call request / approval message transmission and the use of DTMF tone information will be described in detail with reference to the video call request / approval message generator 240 below.

In one embodiment, the video call device 200 generates a video call request message in response to receiving a video call request from a user, and generates a video call approval message in response to receiving a video call request from another device. The video call request / approval message generator 240 may be further included.

In an embodiment, the video call request / authorization message generator 240 may generate a video call request message or a video call approval message according to H.323 or SIP. In one embodiment, the video call request / approval message generator 240 may generate a video call request message including its PSTN phone number. In an embodiment, the video call request / authorization message generator 240 may generate a video call request message including DTMF tone information for a video call transmitted from the PSTN interface 220.

3 is a diagram illustrating a video call request message according to an embodiment of the present invention. In one embodiment, the video call request message 300 may be generated according to the SIP standard, as shown in FIG. The video call request message 300 may include a PSTN telephone number by defining a <tel> variable of the P-Asserted-Identity field. In this embodiment, the PSTN telephone number is 1000.

Alternatively, the PSTN phone number may not be included in the video call request message 300. In this case, as will be described later, the PSTN phone number of the device that has transmitted the video call request message 300 to the ENUM server 162 (see FIG. 1) can be obtained to obtain the PSTN phone number. In one embodiment, the message for requesting the PSTN phone number to the ENUM server 162 may include the Internet phone number of the device that transmitted the video call request message 300. As shown in FIG. 3, the video call request message 300 may include an internet phone number by defining a <sip> variable of the P-Asserted-Identity field.

On the other hand, the video call request message 300 may include a DTMF value in the media portion of the Session Description Protocol (SDP). That is, as shown in FIG. 3, a DTMF value may be included in a = X-pstn-index field. Note that the video call request message shown in FIG. 3 is merely an example and the present invention is not limited thereto.

As illustrated in FIG. 2, the video call request / approval message generator 240 may further include a phone number acquisition unit 242. The phone number obtaining unit 242 may obtain an internet phone number of the voice call counterpart device and an internet phone number of the device that has transmitted the video call request message.

In one embodiment, when the video call apparatus 200 requests a video call to the voice call counterpart device, the phone number obtaining unit 242 may obtain the Internet phone number of the counterpart device necessary for generating the video call request message. . In one embodiment, the phone number acquisition unit 242 transmits a message requesting the Internet phone number of the voice call counterpart device to the ENUM server 162 (see FIG. 1), and receives a voice call from the response of the ENUM server 162. The Internet telephone number of the counterpart device can be obtained. In another embodiment, the phone number obtaining unit 242 may include a key button and the like, and may obtain an internet phone number by receiving an internet phone number of the counterpart device through a key button from a user. In another embodiment, the phone number obtaining unit 242 includes an internal memory (not shown) for storing a phonebook, and the phone number obtaining unit 242 may query the memory by a name or obtain a call from the PSTN interface 220. Internet phone number can be obtained by inquiring with PSTN phone number.

In one embodiment, when the video call device 200 receives a video call request message from another video call device, the phone number acquisition unit 242 determines whether the device that transmitted the video call request message is the other party in the current voice call. Alternatively, the PSTN phone number of the device that has transmitted the video call request message and the PSTN phone number of the counterpart device currently in the voice call may be obtained to distinguish the device from another device. In one embodiment, the phone number obtaining unit 242 may receive the CID information from the PSTN interface 220 to obtain the PSTN phone number of the counterpart device currently in the voice call.

In one embodiment, the phone number acquisition unit 242 transmits a message requesting the PSTN phone number of the device that sent the video call request message to the ENUM server 162, and receives a video call from the response of the ENUM server 162. The PSTN telephone number of the device that transmitted the request message may be obtained. In one embodiment, when it is not possible to access the ENUM server 162, the phone number acquisition unit 242, the PSTN phone of the device that transmitted the video call request message from the video call request message as shown in FIG. The number can be obtained. That is, the phone number obtaining unit 242 may obtain the PSTN phone number of the device that transmitted the video call request message from the P-Asserted-Identity field of the video call request message.

In one embodiment, when it is not possible to obtain the PSTN phone number of the current voice call counterpart device, the phone number obtaining unit 242 may replace the PSTN phone number with the DTMF tone information transmitted by the current voice call counterpart device and the video call. DTMF tone information included in the request message can be obtained. In one embodiment, the phone number obtaining unit 242 may obtain the information of the DTMF tone for the video call from the video call request message as shown in FIG. That is, the phone number obtaining unit 242 may obtain the DTMF tone information for the video call from the DTMF field of a = X-pstn-index of the video call request message.

As shown in FIG. 2, the video call request / approval message generator 240 may further include a phone number determiner 244. The phone number determination unit 244 compares two PSTN phone numbers or two DTMF tone information obtained by the phone number acquisition unit 242, and whether the device for transmitting the video call request message is the same as the voice call counterpart device. Can be determined.

As illustrated in FIG. 2, the video call apparatus 200 may further include an IPN interface 250 that transmits and receives a video call request message and a video call approval message, and transmits and receives video data. In one embodiment, the IPN interface 250 is a message for requesting the Internet phone number of the voice call counterpart device generated by the phone number obtaining unit 242 and the PSTN phone number of the device transmitting the video call request message. Can be transmitted to any server operating a video call service according to a SIP server 164 (FIG. 1) or a standard communication standard such as an H.323 standard, and a response message can be received.

In one embodiment, the IPN interface 250 displays the received image data on a display device (not shown) such as a monitor, and displays the image data input from an image acquisition device (not shown) such as a camera. ) May be connected to the image processing unit 260 that converts the data to be transmitted through the. The image processor 260 may be implemented by a technique known in the art or a technology to be developed in the future, and details thereof are omitted herein.

According to an embodiment of the present invention, through a message exchange according to a standard communication standard, it is possible to perform a video call to transmit and receive voice data through the PSTN and to transmit and receive video data through the IPN. Therefore, it does not require a separate server or a separate protocol for performing a video call, and can perform a video call for transmitting and receiving voice data with high quality according to a standard communication standard.

According to an embodiment of the present invention, the video call device may access the ENUM server to check the Internet phone number of the counterpart device. Therefore, the video call can be carried out according to the standard.

According to an embodiment of the present invention, the video call device may access the ENUM server and check the PSTN phone number of the device that has transmitted the video call request message. Therefore, since the device that sent the video call request message is the same as the device currently in the voice call, the video call request can be approved, thereby preventing the collision of the call.

According to an embodiment of the present invention, the video call device may check whether the device that transmits the video call request message and the device currently in the voice call are the same from the information included in the video call request message. Therefore, even when the ENUM server cannot be accessed, the collision of the call can be prevented by checking whether the device that has transmitted the video call request message and the device currently in the voice call are the same.

4 is a logical flowchart of a process of performing a video call according to an embodiment of the present invention. It is noted that the steps of the video call execution process 400 shown in FIG. 4 are exemplary, and each step may be combined, separated or omitted, and the order of the steps may be changed.

First, the video call device 1 120a and the video call device 2 120b may perform a voice call through the PSTN (S100). In one embodiment, the video calling apparatuses 1 and 2 120a and 120b may include the configuration of the video calling apparatus illustrated in FIG. 2. As shown in FIG. 4, the video call device 1 120a may receive a video call request from a user (S200). In an embodiment, in response to receiving the video call request from the user, the video call device 1 120a may transmit DTMF tones for the video call to the video call device 2 120b through the PSTN (S205).

Next, the video call device 1 120a may transmit an internet phone number request message of the video call device 2 120b to the ENUM server 162 through the IPN (S210). In one embodiment, the Internet phone number request message may include the PSTN phone number of the video call device 2 (120b). Next, the ENUM server 162 can search the internal database to retrieve the Internet phone number of the requested video call device 2 120b, and send a response message including the Internet phone number to the video call device 1 120a. There is (s220). In contrast, the video call device 1 120a may acquire the Internet telephone number of the video call device 2 120b through a user input button or a phone book stored in an internal memory.

In operation S230, the video call device 1 120a may transmit a video call request message to the SIP server 164 through the IPN. In one embodiment, SIP server 164 may include any server operating a video telephony service in accordance with standard communication standards such as H.323. In one embodiment, the video call request message may include a PSTN telephone number of the video call device 1 120a or information of a specific DTMF tone for a video call transmitted or to be transmitted through the PSTN. The SIP server 164 may transmit a video call request message to the video call device 2 120b through the IPN (S240).

In operation S250, in response to receiving the video call request message, the video call device 2 120b checks whether the device that sent the video call request message is the same device as the voice call counterpart device or a different device. In order to transmit the video call request message to the ENUM server 162 through the IPN, a message for requesting the PSTN phone number of the device may be transmitted. In one embodiment, the message for requesting the PSTN phone number may include the Internet phone number of the device that transmitted the video call request message. Next, the ENUM server 162 may search the internal database to retrieve the requested PSTN phone number, and transmit a response message including the PSTN phone number to the video call device 2 120b (S260). In contrast, the video call device 2 120b may obtain the PSTN phone number or DTMF tone information of the device that transmitted the video call request message based on the information included in the video call request message. For example, as illustrated in FIG. 3, when the PSTN phone number is included in the video call request message, steps s250-s260 may be omitted and step s270 may be immediately performed.

In operation S270, the video call device 2 120b may determine whether the device that sent the video call request message is the same as the voice call counterpart device 1 120a. In an embodiment, the video call device 2 120b may compare the PSTN phone numbers of the device for transmitting the video call request message with the voice call counterpart device 120a to determine whether the same is true. In contrast, the video call device 2 120b compares the DTMF tone information included in the video call request message with the DTMF tones received through the PSTN, and transmits the video call request message to the current voice call counterpart device 120a. You can check whether it is the same.

If it is determined that the device that sent the video call request message and the current voice call counterpart device 1 120a are the same, the video call device 2 120b may transmit a video call approval message to the SIP server 164 (S280). . Next, the SIP server 164 may transmit the video call approval message to the video call device 1 120a. As such, when the exchange of the video call request / approval message is completed, the video call device 1 120a and the video call device 2 120b may perform the video call through the IPN (S300).

According to an embodiment of the present invention, through a message exchange according to a standard communication standard, it is possible to perform a video call to transmit and receive voice data through the PSTN and to transmit and receive video data through the IPN. Therefore, it does not require a separate server or a separate protocol for performing a video call, and can perform a video call for transmitting and receiving voice data with high quality according to a standard communication standard.

According to an embodiment of the present invention, the video call device may access the ENUM server to check the Internet phone number of the counterpart device. Therefore, the video call can be carried out according to the standard.

According to an embodiment of the present invention, the video call device may access the ENUM server and check the PSTN phone number of the device that has transmitted the video call request message. Therefore, since the device that sent the video call request message is the same as the device currently in the voice call, the video call request can be approved, thereby preventing the collision of the call.

According to an embodiment of the present invention, the video call device may check whether the device that transmits the video call request message and the device currently in the voice call are the same from the information included in the video call request message. Therefore, even when the ENUM server cannot be accessed, the collision of the call can be prevented by checking whether the device that has transmitted the video call request message and the device currently in the voice call are the same.

5 is a flowchart illustrating a video call method according to an embodiment of the present invention. Note that the steps of the method 500 for performing a video call shown in FIG. 5 are exemplary, and each step may be combined, separated or omitted, and the order of the steps may be changed. In one embodiment, the method 500 for performing a video call may be performed in the video call apparatus 200 shown in FIG. 2.

As shown in FIG. 5, a voice call may be performed through the PSTN (S510). Next, the user may receive a video call request from the user (S520). In an embodiment, step s520 may be performed by the video call request / approval input unit 210 shown in FIG. 2.

In operation S530, an internet telephone number of the counterpart device may be obtained. In an embodiment, step s530 may include querying the ENUM server 162 (FIG. 1) to obtain an Internet phone number of the counterpart device. In another embodiment, step s530 may include acquiring an Internet phone number of the counterpart device through a user input button or a phonebook stored in an internal memory. In an embodiment, step s530 may be performed by the phone number obtaining unit 242 shown in FIG. 2.

Next, the video call request message including the Internet phone number of the counterpart device may be transmitted (S540). In an embodiment, step s540 may include transmitting a video call request message to a SIP server 164 (FIG. 1) or any server operating a video call service according to a standard communication standard such as H.323. In an embodiment, step s540 may be performed through the video call request / approval message generator 240 and the IPN interface 250 shown in FIG. 2.

In operation S550, a video call approval message may be received. In one embodiment, step s550 may be performed through the IPN interface 250. Next, a video call can be performed through the IPN (s560). In an embodiment, step s560 may be performed by transmitting and receiving image data through the IPN interface 250.

According to an embodiment of the present invention, through a message exchange according to a standard communication standard, it is possible to perform a video call to transmit and receive voice data through the PSTN and to transmit and receive video data through the IPN. Therefore, it does not require a separate server or a separate protocol for performing a video call, and can perform a video call for transmitting and receiving voice data with high quality according to a standard communication standard.

According to an embodiment of the present invention, the video call device may access the ENUM server to check the Internet phone number of the counterpart device. Therefore, the video call can be carried out according to the standard.

6 is a flowchart illustrating a video call method according to an embodiment of the present invention. It is noted that the steps of the method 600 for performing a video call shown in FIG. 6 are exemplary, and each step may be combined, separated, or omitted, and the order of the steps may be changed. In one embodiment, the video call method 600 may be performed in the video call device 200 shown in FIG.

As shown in FIG. 6, a voice call may be performed through the PSTN (S610). Next, a video call request message may be received from another device through the IPN (s620). In an embodiment, step s620 may include receiving a video call request message from a SIP server 164 (FIG. 1) or any server operating a video call service according to a standard communication standard such as H.323. In an embodiment, step s620 may be performed at the IPN interface 250 shown in FIG. 2.

In operation S630, it may be determined whether the device that transmitted the video call request message and the voice call counterpart device are the same. In an embodiment, the step s630 may include obtaining a PSTN phone number of the device that has sent the video call request message to the ENUM server 162 (FIG. 1) and a voice call received through the obtained PSTN phone number and CID. And comparing the PSTN telephone numbers of the counterpart device. In another embodiment, step s630 is a step of acquiring a PSTN phone number of the device that transmitted the video call request message from the video call request message and a PSTN phone number of the voice call counterpart device received through the obtained PSTN phone number and CID. It may include the step of comparing. In another embodiment, step s630 may include comparing DTMF tone information included in the video call request message with DTMF tones for the video call received through the PSTN. In an embodiment, step s630 may be performed by the phone number obtaining unit 242 and the phone number determining unit 244 shown in FIG. 2.

If the device that transmits the video call request message is the same as the voice call counterpart device, the video call approval message may be transmitted to the server that transmitted the video call request message (S640). In an embodiment, step s640 may be performed through the video call request / approval message generator 240 and the IPN interface 250 shown in FIG. 2.

In operation S650, a video call may be performed through the IPN. In an embodiment, the step s650 may be performed by transmitting and receiving image data through the IPN interface 250.

According to an embodiment of the present invention, through a message exchange according to a standard communication standard, it is possible to perform a video call to transmit and receive voice data through the PSTN and to transmit and receive video data through the IPN. Therefore, it does not require a separate server or a separate protocol for performing a video call, and can perform a video call for transmitting and receiving voice data with high quality according to a standard communication standard.

According to an embodiment of the present invention, the video call device may access the ENUM server and check the PSTN phone number of the device that has transmitted the video call request message. Therefore, since the device that sent the video call request message is the same as the device currently in the voice call, the video call request can be approved, thereby preventing the collision of the call.

According to an embodiment of the present invention, the video call device may check whether the device that transmits the video call request message and the device currently in the voice call are the same from the information included in the video call request message. Therefore, even when the ENUM server cannot be accessed, the collision of the call can be prevented by checking whether the device that has transmitted the video call request message and the device currently in the voice call are the same.

While the invention and its various functional components have been described in particular embodiments, the invention may be implemented in hardware, software, firmware, middleware, or a combination thereof, and the system, subsystem, components or sub-configurations thereof. It should be understood that they can be used as elements. If implemented in software, the elements of the invention are instructions / code segments for performing the necessary tasks. The program or code segments may be stored in a machine readable medium, a computer program product, such as a processor readable medium, or by a computer data signal embodied in a carrier wave or a signal modulated by a carrier to a transmission medium or a communication link. Can be sent through. Machine readable media or processor readable media may include any medium that can store or transmit information in a form readable and executable by a machine (eg, processor, computer, etc.).

Although the present invention has been described and illustrated with reference to the embodiments, those of ordinary skill in the art, various modifications and equivalent other implementation without departing from the spirit and scope of the present invention defined by the appended claims It will be appreciated that examples are possible.

1 is a schematic diagram of an exemplary network environment in which the present invention may be practiced.

2 is a block diagram of a video call device according to an embodiment of the present invention.

3 illustrates a video call request message according to an embodiment of the present invention.

4 is a logical flow diagram of a process of performing a video call according to an embodiment of the present invention.

5 is a logical flow diagram of a video call method according to an embodiment of the present invention.

6 is a logical flowchart of a video call method according to an embodiment of the present invention.

Claims (20)

delete delete As a video call device, Public switched telephone network (PSTN) interface for transmitting and receiving voice data, During a voice call through the PSTN interface, a video call generating a video call request message according to H.323 or Session Initiation Protocol (SIP) based on information related to a PSTN phone number of a counterpart device transmitting and receiving the voice data. Request / approval message generation unit, and During the voice call through the PSTN interface, the IPC (Internet Protocol Network) interface for transmitting the video call request message, receives the approval message for the video call request message, and transmits and receives video data, The video call request / approval message generator generates a message for requesting an internet phone number of the counterpart device to a telephone numbering mapping (ENUM) server based on the PSTN phone number of the counterpart device, and generates a message from the response of the ENUM server. A video calling device, which obtains an Internet telephone number of a counterpart device. delete As a video call device, Public switched telephone network (PSTN) interface for transmitting and receiving voice data, A video call request / approval message generator for generating a video call request message according to H.323 or a Session Initiation Protocol (SIP) based on information associated with a PSTN telephone number of a counterpart device transmitting and receiving the voice data; Includes an IPN (Internet Protocol Network) interface for transmitting the video call request message, receiving an approval message for the video call request message, and transmits and receives video data. The PSTN interface transmits a DTMF tone for a video call to the counterpart device, The video call request / approval message generating unit generates a video call request message including information of DTMF tones for the video call. delete delete As a video call device, Public switched telephone network (PSTN) interface for transmitting and receiving voice data, A video call request / approval message generator for checking whether the counterpart device for transmitting / receiving the audio data is the same as the device for transmitting the video call request message and generating a video call approval message; Includes an Internet Protocol Network (IPN) interface for receiving the video call request message, transmitting the video call approval message, and transmitting and receiving video data according to H.323 or Session Initiation Protocol (SIP). The video call request / approval message generator is configured to request a PSTN phone number of a device that transmits the video call request message to a telephone numbering mapping (ENUM) server based on an internet phone number of the device that transmitted the video call request message. Generating a message and obtaining a PSTN telephone number of a device that has transmitted the video call request message from the response of the ENUM server. delete As a video call device, Public switched telephone network (PSTN) interface for transmitting and receiving voice data, A video call request / approval message generator for checking whether the counterpart device for transmitting / receiving the audio data is the same as the device for transmitting the video call request message and generating a video call approval message; Includes an Internet Protocol Network (IPN) interface for receiving the video call request message, transmitting the video call approval message, and transmitting and receiving video data according to H.323 or Session Initiation Protocol (SIP). The PSTN interface receives a DTMF tone for a video call, The IPN interface receives the video call request message including DTMF tone information, The video call request / approval message generating unit obtains DTMF tone information from the video call request message, and indicates whether the DTMF tone received from the PSTN interface and the DTMF tone information obtained from the video call request message indicate the same DTMF tone. Judging, video call device. delete delete As a video call method, a) transmitting and receiving voice data through a public switched telephone network (PSTN), b) generating a video call request message according to H.323 or Session Initiation Protocol (SIP) based on information associated with a PSTN telephone number of a counterpart device transmitting and receiving the voice data; c) transmitting the video call request message and receiving an approval message for the video call request message through an Internet Protocol Network (IPN), and d) transmitting and receiving image data through the IPN, In step b), a message for requesting an internet phone number of the counterpart device is transmitted to a telephone numbering mapping (ENUM) server based on the PSTN phone number of the counterpart device, and the response message of the counterpart device is received from the response message of the ENUM server. And obtaining an internet phone number. delete As a video call method, a) transmitting and receiving voice data through a public switched telephone network (PSTN), b) generating a video call request message according to H.323 or Session Initiation Protocol (SIP) based on information associated with a PSTN telephone number of a counterpart device transmitting and receiving the voice data; c) transmitting the video call request message and receiving an approval message for the video call request message through an Internet Protocol Network (IPN), and d) transmitting and receiving image data through the IPN, The step b) further comprises the step of transmitting a DTMF tone for a video call to the counterpart device through a PSTN, And the video call request message includes an information field of DTMF tones for the video call. delete delete As a video call method, a) transmitting and receiving voice data through a public switched telephone network (PSTN), b) receiving a video call request message via an Internet Protocol Network (IPN) in accordance with H.323 or Session Initiation Protocol (SIP), c) checking whether the counterpart device transmitting and receiving the voice data and the device sending the video call request message are the same; and d) transmitting a video call approval message through the IPN and transmitting and receiving video data; Step c) transmits a message for requesting a PSTN telephone number of the device that transmitted the video call request message to a telephone numbering mapping (ENUM) server based on the Internet telephone number of the device that transmitted the video call request message. And acquiring a PSTN telephone number of a device that has transmitted the video call request message from the response of the ENUM server. delete As a video call method, a) transmitting and receiving voice data through a public switched telephone network (PSTN), b) receiving a video call request message via an Internet Protocol Network (IPN) in accordance with H.323 or Session Initiation Protocol (SIP), c) checking whether the counterpart device transmitting and receiving the voice data and the device sending the video call request message are the same; and d) transmitting a video call approval message through the IPN and transmitting and receiving video data; In step c), the DTMF tone information is obtained from the video call request message, and the DTMF tone received from the PSTN and the DTMF tone information obtained from the video call request message indicate the same DTMF tone. , Video call method.

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